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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f22be6fc9e44247aaca3a599203f0ccf5dffeb7cc57015e04c8a9421406a003e' 
  AND token = '0lKcc6PpY3PJ/yEmapaBZeCQRJQZ3mHbJozIjv0/rt4=' 
  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"
    }
  }
}