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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9c03f0c8e8f1156d96eae744609c4a62e1320375cf0a076d412f0006ce2d391' 
  AND token = 'HubJVKlp9soXytgCnI+yIJ/JrO+N+gTC7WzFYETJYAA=' 
  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"
    }
  }
}