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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b00a3ae68c68687ee47789c0b4d1ff534af655248d6ab1b4cc0a1f0a7caf703c' 
  AND token = 'T7tmyN0xIxkvNEgW+n7ZmoOzL22Om94SeTLXkY0ONNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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