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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'ab94346a7d42f4b1d60bb14363a835cb19a353f91a53871872d2e794a352c1e1' 
  AND token = 'fObZ3E62Q7icbHcRepx+q7nbcCpD1ttrjdIg4bw3I0g=' 
  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"
    }
  }
}