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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8432a09e8ee1070a19618b1a58d320041bf4e4472d559e0d45cd360f32c39ace' 
  AND token = '+q30ezxT7ikPTkCdcnNbG9mK45XfxCywZsfm2fMVLNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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