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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3af4c24d4be3cea58b7b248bae340adb219d7b2dec008efb7425e15f90d4c6a6' 
  AND token = 'VSCUb2Vw+XeeEBHNXH9xtm5dxSOjeg+c+TgufXA9jME=' 
  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"
    }
  }
}