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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e14ff2c4fe177f6f259e27c625222639c2680bc63777b429452a533447e48d9a' 
  AND token = 'nC83Abn1TJ52ENvU7fh2WyJKnTQMqzq1qu3X/EFY27o=' 
  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"
    }
  }
}