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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f18e7e5e5432ce3f72ab3083b1d9273a5e2f636043dd969827777f40660c5ec' 
  AND token = 'cQIJ5dI5qR1Xlj6b3ArnFofnD0F4dzMPlYLrYuYDN1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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