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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c023334e76b344910ad03c355ab354ef5dc0be406d3a508f74849bfba306ac0' 
  AND token = '/Gi2KzSPORGmLI4PrWl6nb2+i7jrgfAxRH0kJfV2dPw=' 
  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"
    }
  }
}