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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae33ca1dc30e275d28cc98efab83891be72df3f8bfc0365c6a24a964340d8bc6' 
  AND token = '5wNizA15+DmLMAYmdkr0sR5mybrddnuD/OZPcGsTCSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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