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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '3269bdd42a24bbf9f36c40e2703e386c8d75dfc7f9082f1877ea98b3fba76815' 
  AND token = 'EI4s1vDGLUqXNuF0gvnzc2W5yN3dSsbaWOjWLdax7uM=' 
  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"
    }
  }
}