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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b6e3f51ea190c8afe4149c3516213842dc3ac9b0a2fb263439750b7d36b36f7' 
  AND token = '55j5eUvRKNTVQfsjXzryAMvLn+60fHW6Ycq5Zq/rA74=' 
  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"
    }
  }
}