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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '1c0c7a7f948d31b16f61b907a0e20878ae47e3dd952990eb9f29b626d7cc87f3' 
  AND token = 'u/nxqomUjgS75pNevcNjLdoRVxUBscuvCKauwa5BSwo=' 
  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"
    }
  }
}