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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18a91c3006bb9f9c9bf106e565b859f884548bba2d5ec79b1f0c47be97a7d2f3' 
  AND token = 'KxxtflOXILUcOjJOt9GmR0UDDLYOmCyZbcKGh4U/cpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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