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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a203f0b284820876f2690d3e2bdbda1a1f764ba1e8b782e82a2b5e67355cae0b' 
  AND token = 'tMccBKwh6HJXDp/fMYtn0S+N5qBcDxVo5g8QZaUo/Zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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