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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '4ee0b5e84b36701b3002ab42336c3a6536bb9468f05d5d58a22574bc73ffb7b0' 
  AND token = 'Y3NwG4n8xsEQADiVr0A9D1GvhIMtCirexTXFes5ifeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}