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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '591fcefce850a7ee5c77372ac951f8eb74aff8515be4b4b63023790ae6842e25' 
  AND token = 'pSP+s0QSfTZhooO395qccI9imZ5Re0vrVMYM05Ztk/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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