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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '9a6e0be6b77c9bebf8fc17ce34987c8f2b37fff2248f63c4a96557e25c5103f7' 
  AND token = 'sXokiXC3axzQ8oKmEfpi9AmxaksgMhEBaiB0Ee8KJUs=' 
  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"
    }
  }
}