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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5d0db70bb515d3452a2866a568796582bd2ebc817ce11c9df0bb19536103ff1' 
  AND token = 'e2pUe/JR6IUgV7L0PnjyDM/fJV6q4BAwbU1HrgPgea4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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