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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bf3bf4026c75931056178eb3f63c9025d16396e575e00a1553c275bbac0e6ae' 
  AND token = 'hLhpLZHY/YU/Tkx7U1wkzjkeEm5Kd1rITZm7mFWrLRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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