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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '792c2603fe79fec0f65e170ff41a71df2eedf0381af549f464f6f282f31d219a' 
  AND token = 'O8YVUvDdR1wycgmlewrXLSghZX2LlFQj9DzDdS2n98U=' 
  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"
    }
  }
}