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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '70279c83cfb3f17ac5db8913d806ba68b80caf4e14a5dfa852d6e8d199da204f' 
  AND token = 's6avzv2j/HBFZv7JLNIcjJuUTR5jBDS4OcU5F08G1QQ=' 
  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"
    }
  }
}