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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ce39e2410f3b7c8f5be649bf9c8a8ff90d2c8b80e7894128229553875d534f2' 
  AND token = 'jum/sntmdNqf+poTMK6atimDO+55KgvP2ehfFzr4MT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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