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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'bd138f4176456c85e449675ee445c56187fbb8a084f97c58e91c4a4b6fc7e407' 
  AND token = 'YH2Th2sLS42fuKUwAUroR7e25NbSSO5GOc9kom0pXuw=' 
  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"
    }
  }
}