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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fea47abe93ce0a822e287c9909770773b0f2d94493bab4d2531f9f25da796ae2' 
  AND token = 'dIFt0e0uIR5FfLOnYn8lJZLXa4/Yp1USdpwe9pne+MM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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