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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6c5c2811dcb40b01df8e595515a8feb614bbf164a7225f574bc64241971fbd7' 
  AND token = 'gFYmco/a2Y+xfiCGVE0yPb7BdXz8mv7J+VmH+de7vOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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