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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47e282a08716704211775dbabe78920faffd6c7fa209072bdb686635c043bc77' 
  AND token = '/tx1e/K9dH7Hdzaa/yJTXSOkvUZdR0Nwy3Hr9hB7hS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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