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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '912f46fe1961f8bcc536f52898a015e11b7081fd8672ada70c78f44c6a2e47ed' 
  AND token = 'JG7xvDEBxcFC29nCL6xO6IyyfKBsTuM64EmMai7ekDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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