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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '1226ce8226c5704982b8ca78d54f8443e4590d3089ec2b8c1be1309e6502ea30' 
  AND token = '62pSlmwnL1Qrnq2V0Cvy5JZuWquH/eoivimcRpdjAhg=' 
  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"
    }
  }
}