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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be089f856101c89d991a23ed01ac7e6268f3093a9a0456cda9537ebe97c894e0' 
  AND token = '+SNphq80D2qjKZwl1SiZvz6kUSDrLy7Gh4Teuaa7Ob0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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