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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91def281765539dee27d46d6ae95f80f0b26cdbd4f2220bc829d5b3fb04551fb' 
  AND token = 'TpTSWjkZ6/Fu82q8BL0xkQStToFFkBTaRdDLHw5L46Q=' 
  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"
    }
  }
}