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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e287e4e81f7505a6294b1c7be13a951e9eb0f1e074df24782b06d9c3d3dfd85e' 
  AND token = '/yed/+uC2G6n+OWImLow2mB/LcK7xeoEd2wQarrMBOU=' 
  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"
    }
  }
}