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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '6f5e59bdf2c2a679f2d0cdd160717f01894d4ab6db440a505326aecad80132be' 
  AND token = 'ebTQhZzB/e/kDtgbK0OVU5fI22SlAKscGLmh2Fm69UQ=' 
  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"
    }
  }
}