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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1df6b550622c7536d1d012f29fd99f4224666decd6c87396ad41a0eeba567b9' 
  AND token = 'cDtfAAep403YalpP1FOsD7qIjV1e/F/vl8fr4UJNx5M=' 
  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"
    }
  }
}