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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9722e4af5eaf4f073b3de326a6871b161d50897ba5d50130a50341748025119' 
  AND token = 'L25rW5KwZO+Zo9PeuQ3sodXOQ47ZCiSSst1Z2Xm20Uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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