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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b50466921806ff3bb9297d57b837eed9893bcb13165fed2ffc5ef763041059f5' 
  AND token = '6U6XPc1IxlsYz3UENbn1RQMiGi2z5jBMqyhO8QMDw2c=' 
  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"
    }
  }
}