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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c171051e2816f1886d567d6ffb447c617f6d8e3107a90e936ef318d934b43d5' 
  AND token = 'w26kDgtdGJwfaZUkuro7ZS/0rFgcOS11kLmY/uFts1U=' 
  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"
    }
  }
}