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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '259a26384a47ef7bbd5c338f4a1a44dfd1f264e8d43fca8249b284128e007868' 
  AND token = 'Em40AYPSdA6WXnKtt349JK4A8Yj8nUXSg32vChEVlCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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