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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecc2000d19411e1d3007bb5abbb53943ff0fa56bb34d5c78e42fb1f3df07555b' 
  AND token = 'H8vc7Jnt62ZjNIVQKpvYq2mv9QHXtz6xEtFLROs0C70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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