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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '8e1262660104c7705a5c2acaed6fa6ddcffb8a55d8638810ab3fcca6d588f9ed' 
  AND token = 'ek/+rToC9rQnjfgJ3oveeWKlcLfPpI4x1CkRERVOGDE=' 
  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"
    }
  }
}