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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '291ceeb17012d6de0b849380ef0d874fb96e71e67b40990e4b21b969f78cdd0b' 
  AND token = 'e+y6I40E7PMOpzaVNdNjbWkr3KSE2Zm61D3Wx5DBOX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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