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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be94271f746e70bc1b6d7290bc2f6710ee96d379a3d97a68b5e0fd1a3a7a2229' 
  AND token = 'X5QhygfskPWKTyWYWrS+20dfw4SdjfY6T7gktig35Lc=' 
  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"
    }
  }
}