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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '74633ca5bcdf5065970b49a5cb2f835382cc15f3bfb90291b6288d11cdba2133' 
  AND token = 'fFyJfba5Eg0H6ymExqaX9fG50Vzo4vFsnnXS33POBrQ=' 
  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"
    }
  }
}