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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f0338b2657803ca65974e7a04e43e72ea25f0aefc76485a439437b3c1584cfa' 
  AND token = '8mgft/UYGEN+feGrdVA4NIOBRRAyh+nXIvCPYqfYdAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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