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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '311ffb5b4086fe723dafb34c5f851fa7a3ed3493cc5b5979dbdd0466e08adfbe' 
  AND token = 'IomhVKcU0wmOPkh6+IHF1d4VGBE3G/D1Fltcmp2tr7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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