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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6e1fbb9409d9a032da30187399cbc1c2974c69acafd34c3bef2d122405f01e4' 
  AND token = 'D8MyF26cTWQ1o7HpMbpMN0t7b8djH37ni73hGkZlEdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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