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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2d82fe59b7b84490ff819ace9fd05114298075ee82dc649d46e025e73eed5f6' 
  AND token = 'Y+vEOl16P11Yciu6Dfv/MZyeu16af2+KVLwELUW2DXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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