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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '359cfdad4eeb2a991a7f5f023b9a4a81e12b7ed8c08effdf3159a8f30f9db8d6' 
  AND token = 'pYs73ThQHgctayb8Qs58rw1zU43vDnGS973A6F+iZZM=' 
  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"
    }
  }
}