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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '776e5eb8447ec2474d1e1dad0a7fef8434fc636a040aee2c4c72920e83c0c303' 
  AND token = 'hctrNh4ZDg+ODAbI6TXCm9RiAHnGpWTxH+G6ASpGlFo=' 
  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"
    }
  }
}