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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8349d5e0ab0da803904a1c5cf45dcdfb46edd06a7e13ff4cf5b4f4fac5c74948' 
  AND token = 'Fya40h5JdlNKwpUSL3dChDS5ti60ekjjNF7H5qMlT9I=' 
  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"
    }
  }
}