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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'b103c434c6918d12dce6b72260edb6c0356785c2355a878c3e413fa100ecc873' 
  AND token = 'k/nx/9/tluQ8fO5ksqTzW0xKSEFVr9AgMOHvEs9Tv74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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