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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c0f93a18a581854d4cfe329ae451490bda4f09fbf2a17288d80d99ea47bf3bb' 
  AND token = '+5DS7R4HbXp4fsMKrHlap89NvnKg6iaH7Wquc5z6Puw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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