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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70e79247d1a29396196bd98d8085e9ce509790d129af3bc8feb4ad4939044582' 
  AND token = 'T8E8a2RzWmvu1DoQqJPeHP9TdDMUnlrNEARExqZKZx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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