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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbea93d27e8da6f6a506a727b073a949143f34c2619d70faebfa7a9a257188e7' 
  AND token = 'Z+3WKp9zdvfzrtkZBEVc8gkhIzs5xIic7740LJ2rVMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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