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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '403fb1fdfbc220fadcbebb8f6b7d18ec3e853d50b27e22841f8ddba3eea0fbaf' 
  AND token = 'E0Enaek4R0gRdBfG1tUmRFXQWACUMvonxHhnT9GNyUY=' 
  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"
    }
  }
}