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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f805a3c511b9b353c019c4c144f2946a77da7df81c9a8b8f493480253e16e809' 
  AND token = '9eYylskNuD2eYahdkJy2rNv5VAgYH5iFS/SeJ2f7xsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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