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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cca0e636e939544fcd498bfc9be7458150ad7a22b8582ad7abd87203bc4bde64' 
  AND token = 'DDrvLuEd6NIff+WhG9Rg7u9EgaECFK9iUP655/nDJYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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