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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '56c68ec8bb307b67d756fcfbc22b7023f0e12252fb9f030c86908c6aecab7ea5' 
  AND token = '7+axjo/IVE4zl2BdSm/oVO13sPDmnvgh6RTIdeF6rhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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