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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2e274bce4e13c39b562a7ab989ed2e9054bb0708b83e61d8aa46ee712b1fcc6' 
  AND token = 'IoAfNwbf2QoTEjpZZ39S2QbWYHfamY5KIPayzz3MR08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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