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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'fea29bf81318581225193aa043d351fde242013af2d555375655f3169e1dd8c0' 
  AND token = 'tQKCSO3m3DPZ3gc5HeB6bk3dfxiC27R+2/Lfl3JteFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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