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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59545ec74ae0a2d72fcea20092398200d08303900126776a2cfb0b8b8cda8e8d' 
  AND token = 'NZ0toQnCdQhIKj6Ijy3CjLyhcYZLdR9+g7OAX29t+ME=' 
  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"
    }
  }
}