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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3430a5c8c20fc11e5c43d779a8411fd171b32e45306090576cbfc97c3721a75' 
  AND token = '9+oqFPULWBPAYLxtzGw7AmxERr3rh7X4axi7s4hE/vM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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