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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd7de9dfd4a57a0b2e158446608de656f4d29c2b2a066163d8310a63873b5d5d' 
  AND token = 'KGKMMv7E2m6YS+y7BYquJgkI5rSGsoaQVPrIjfioVE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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