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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93ee459c198dca43840a52b8dd9576c0cb59a6259b220b4b2483f10b6690bbf9' 
  AND token = 'aKbcgHpDFAo3+B+3EkRbTkLWQe3i+0D216r235fBXmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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