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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '768a4492ed814f6bcc3f1abd386c793e57a60a1c90bdf2e0c660701a63619e86' 
  AND token = 'ZQjk/7mU6WotShF6SAm8Lnl7KK4p4xemPS7lfLarEPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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