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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '6d590cbee6eccd5d5cd5ab92100ab56f6870d166e18230e33b713e17b3f99dab' 
  AND token = '6IJ+hdfXpLgHkRWSL1NDwB7gZYaIWU52Sl0pVXqDATs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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