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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'c87f6ee65cfd79cd97c25261639d0c614e747a6d386c53ee19235ab95717ad49' 
  AND token = 'nE3+Q8jST348qyol1a2NKp5tHqe2qYAwEDgxT94Y7nM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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