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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00e89975a1bc27c7e949d158f6b2251689c8a8c45cdbc345c60b6c546687df8c' 
  AND token = 'eiqKH+uw3EJGuXIFKS21KpdJ6wJ8IVS1rvyMk7Kfq3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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