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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96cc22e9b52915c3f0b6ff461a3ce393ff556a285485505668537667bec85381' 
  AND token = 'sop41ELlZrY4y8uXGX7lXF3glOSdF+fj/uVOFjO8YWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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