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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '743470d5395f4290ef0aea63010e1428125d91f8936d8f9f5eb48ff1cd9ca5de' 
  AND token = 'ZpRTjuDrk6naTTnVFnE8b1AZCMt8qLoL6MNx6E8YBrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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