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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff68b88ad6c1a86a8da70546227676a08678c4971d9072695d6bb203ec2dd761' 
  AND token = 'nmA705fJu7rZ1WEP+lhAUf+k/OxHG6n7Pl0e8aRFytY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}