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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b12366f9a200809395c17e4c22b32f4f0c49890530a10e2ca67c224ff2f36f5a' 
  AND token = 'HEc0gG57FaI4NVh6EmEKfE/o5oJx9alDRQqK3Gffj0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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