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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a318cf6860636f14b486a044cd7f610b23c7b14082e685f4b04d48a94bf8873b' 
  AND token = 'ZZoz+U1VfuGn0gDrx+fY4BYEMeu8syZTKg7+IL33GDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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