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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3c695f89c543e64bce07cb599ce13791b660627880a303b688bd4b4a5aee324' 
  AND token = '2e51P3TjgSsyywYG7SpgfHIHJrDLOd8UBFYZSz8C01s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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