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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d4684428a7bcdaf6f204eb8bbd7f2412c5570bb6dd60d3e974acbde7af62220' 
  AND token = 'b3J2unUjskkG28GTuACEo1W81VWrd1ZbptURyGBAxGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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