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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37f76705a468105714195f0a033fd3df213400a50daf654e2a163eeb09ca6062' 
  AND token = '1sGuNzmN6B3EhU48CMxeJtBNl+vghppTGHocuOrNap4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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